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Chemistry

Chemistry
Maximum permissible concentration of copper in drinking water in mg/L is

1
0.05
2
0.01

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Chemistry
Which of the following fibres catches fire least ?

Terricot
Cotton
Nylon
Rayon

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Chemistry
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives

Hydrogen at cathode and oxygen at anode
Copper at cathode and anodes dissolve to give copper
Copper at cathode and oxygen at anode
Copper at anode and oxygen at cathode.

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Chemistry
What is the product formed when sodium bicarbonate is heated strongly?

Sodium Monoxide
Sodium Peroxide
Sodium Hydroxide
Sodium Carbonate

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Chemistry
Which one of the following is used as preservative for foodstuff ?

Picric acid
Glycerine
Sodium Benzoate
Sodium Chloride

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Chemistry
Which of the following kinds of spectroscopy can provide information on the energy difference between the initial and final states rather the energy levels involved in the transition

UV photoelectron spectroscopy
Rotational spectroscopy
UV absorption spectroscopy
Infrared absorption spectroscopy

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